Direct-current fan control chip

Abstract

A direct-current fan control chip comprises a magnetoresistive sensor, a controller, a driver and a substrate. The magnetoresistive sensor, the controller and the driver are integrated on the substrate. The sensing direction of the magnetoresistive sensor is perpendicular to or parallel to the surface of the direct-current fan control chip. The magnetoresistive sensor provides the controller with a rotor position signal, a rotor speed signal, and rotor a rotation direction signal for the controller. The controller outputs a control signal to the driver according to the received signals. After receiving the control signals, the driver outputs a drive signal. This control chip has the advantages of good temperature stability, good frequency response and so on.

Description

PRIORITY CLAIM TO RELATED APPLICATIONS[0001]This application is a U.S. national stage application filed under 35 U.S.C. § 371 from International Application Serial No. PCT / CN2015 / 076430, which was filed 13 Apr. 2015, and published as WO2015 / 158231 on 22 Oct. 2015, and which claims priority to Chinese Application No. 201420178713.2, filed 14 Apr. 2014, which applications and publication are incorporated by reference as if reproduced herein and made a part hereof in their entirety, and the benefit of priority of each of which is claimed herein.TECHNICAL FIELD[0002]The present invention relates to a control chip, and in particular, to a direct-current fan control chip that uses a magnetoresistive sensor.BACKGROUND ART[0003]With the development of science and technology and the improvement of quality of life, the performance of electronic products is continually improving. The enhancement of the performance of most electronic products is often accompanied by increased power consumption,...

AI Technical Summary

Benefits of technology

[0006]An objective of the present invention is to overcome the above problems existing in the prior art, so as to provide a direct-current fan control chip with a small size, low cost, low power consumption and broad working range.

[0022]Compared with the prior art, the present invention has the following beneficial effects:

[0023](1) The magnetoresistive sensor is integrated with the controller and the driver, which reduces the size and also reduces the device cost and the assembling cost;

[0024](2) The magnetoresistive sensor has low power consumption, especially the TMR sensor;

[0025](3) The magnetoresistive sensor represented by the TMR sensor has good temperature stability, a wide dynamic range and high reliability.

Problems solved by technology

The enhancement of the performance of most electronic products is often accompanied by increased power consumption, and more heat is generated correspondingly.

However, the Hall Effect sensor is great in size and weight, thus increasing the system cost and reducing the reliability.

In addition, the sensor has poor temperature stability and high power consumption.

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